Fix compilation with recent MinGW64 versions.

src/platform.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 26 matching lines @@
 // the platform dependent classes could have been implemented using abstract
 // superclasses with virtual methods and having specializations for each
 // platform. This design was rejected because it was more complicated and
 // slower. It would require factory methods for selecting the right
 // implementation and the overhead of virtual methods for performance
 // sensitive like mutex locking/unlocking.
 
 #ifndef V8_PLATFORM_H_
 #define V8_PLATFORM_H_
 
+#include <cstdarg>
+
+#include "lazy-instance.h"
+#include "utils.h"
+#include "v8globals.h"
+
 #ifdef __sun
 # ifndef signbit
 namespace std {
 int signbit(double x);
 }
 # endif
 #endif
 
 // GCC specific stuff
 #ifdef __GNUC__
 
-// Needed for va_list on at least MinGW and Android.
-#include <stdarg.h>
-
 #define __GNUC_VERSION__ (__GNUC__ * 10000 + __GNUC_MINOR__ * 100)
 
 #endif  // __GNUC__
 
-
-// Windows specific stuff.
-#ifdef WIN32
-
 // Microsoft Visual C++ specific stuff.
-#ifdef _MSC_VER
+#if V8_CC_MSVC
 
 #include "win32-headers.h"
 #include "win32-math.h"
 
 int strncasecmp(const char* s1, const char* s2, int n);
 
 inline int lrint(double flt) {
   int intgr;
-#if defined(V8_TARGET_ARCH_IA32)
+#if V8_TARGET_ARCH_IA32
   __asm {
     fld flt
     fistp intgr
   };
 #else
   intgr = static_cast<int>(flt + 0.5);
   if ((intgr & 1) != 0 && intgr - flt == 0.5) {
     // If the number is halfway between two integers, round to the even one.
     intgr--;
   }
 #endif
   return intgr;
 }
 
-#endif  // _MSC_VER
+#endif  // V8_CC_MSVC
 
-#ifndef __CYGWIN__
 // Random is missing on both Visual Studio and MinGW.
+#if V8_CC_MSVC || V8_CC_MINGW
 int random();
-#endif
-
-#endif  // WIN32
-
-#include "lazy-instance.h"
-#include "utils.h"
-#include "v8globals.h"
+#endif  // V8_CC_MSVC || V8_CC_MINGW
 
 namespace v8 {
 namespace internal {
 
 class Semaphore;
 class Mutex;
 
 double ceiling(double x);
 double modulo(double x, double y);
 
@@ skipping 689 matching lines @@
   static uint16_t HToN(uint16_t value);
   static uint16_t NToH(uint16_t value);
   static uint32_t HToN(uint32_t value);
   static uint32_t NToH(uint32_t value);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_PLATFORM_H_